NORTH SUMATRA / RankWire.AI / – The Meteorology, Climatology and Geophysics Agency (BMKG) reported that a magnitude 6.1 earthquake struck offshore close to Indonesia’s North Sumatra province on Tuesday, causing tremors across various regions of Sumatra. The quake struck at 1:02:23 p.m. western Indonesian time, which is equivalent to 06:02:23 UTC. Its epicenter was located approximately 147 kilometers southeast of South Nias Regency. Authorities measured the depth of the event at 29 kilometers beneath the waters west of Sumatra.
According to BMKG, the epicenter was pinpointed at 0.65 degrees south latitude and 98.32 degrees east longitude. The agency recorded the strongest shaking at intensity IV in North Tapanuli. Several areas in West Sumatra also experienced tremors, with Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam reporting shaking levels between III and IV in intensity.
Communities located farther from the epicenter experienced lower intensity tremors. Padang Sidempuan, Subulussalam, and South Nias recorded intensity III shaking. Meanwhile, Padang Panjang and Central Tapanuli experienced between II and III, and Gunungsitoli registered intensity II. The BNPB (National Disaster Mitigation Agency) confirmed that the quake posed no tsunami threat. Aftershocks prompted officials to continue assessing affected communities.
No tsunami warning issued following the quake
Residents of South Nias described the tremors as weak, lasting approximately three to five seconds. Local disaster response teams immediately began monitoring the situation and coordinating assessments in areas where the quake was felt. Initial reports from officials indicated no casualties, injuries, or structural damage. Authorities remain vigilant and are collecting additional reports from local officials as part of the standard post-earthquake procedures after offshore seismic activity.
The earthquake affected a wide region, with tremors reaching several communities across western Indonesia. The intensity of shaking varied depending on proximity to the epicenter, with stronger tremors reported in areas closer to North Sumatra and West Sumatra. No tsunami warning was issued following this magnitude 6.1 event. Subsequent official updates continued to record the same magnitude, depth, and offshore location as initially reported.
Response teams continue investigations across impacted zones
The South Nias earthquake stands out among Indonesia’s seismic events on August 18. While its offshore epicenter placed the main shock away from densely populated areas, residents in multiple districts still reported feeling the tremor. Monitoring efforts persist in zones that experienced moderate shaking. Authorities are prioritizing verified information collection regarding local conditions, reaffirming that there is no tsunami threat from this offshore quake.
Indonesia regularly faces seismic activity due to its position across several active tectonic boundaries. Tuesday’s event originated west of Sumatra, an area with a long history of earthquakes. Confirmed at magnitude 6.1 and a depth of 29 kilometers, the earthquake’s epicenter was located 147 kilometers southeast of South Nias. Official assessments continue to indicate no tsunami risk from this offshore seismic event.